The UGREEN USB 3.0 to Gigabit Ethernet Adapter (often model 20256 or 40321) adds a high-speed RJ45 Gigabit Ethernet port to computers, laptops, and consoles without one, offering stable wired speeds up to 1000Mbps. It supports USB 3.0 (up to 5Gbps), is compatible with Windows, macOS, Linux, and Nintendo Switch, and features a durable aluminum shell (on some models) for improved heat dissipation